55143251 has 4 divisors (see below), whose sum is σ = 55898712. Its totient is φ = 54387792.

The previous prime is 55143247. The next prime is 55143281. The reversal of 55143251 is 15234155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15234155 = 5 ⋅3046831.

It is a cyclic number.

It is not a de Polignac number, because 55143251 - 2² = 55143247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55143251.

It is not an unprimeable number, because it can be changed into a prime (55143241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377621 + ... + 377766.

It is an arithmetic number, because the mean of its divisors is an integer number (13974678).

Almost surely, 2^55143251 is an apocalyptic number.

55143251 is a deficient number, since it is larger than the sum of its proper divisors (755461).

55143251 is an equidigital number, since it uses as much as digits as its factorization.

55143251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755460.

The product of its digits is 3000, while the sum is 26.

The square root of 55143251 is about 7425.8501870156. The cubic root of 55143251 is about 380.6251275656.

The spelling of 55143251 in words is "fifty-five million, one hundred forty-three thousand, two hundred fifty-one".